Prepaid phone cards

Can anyone tell me the answer to this question?

I have a phone with no SIM card that I no longer use. My sis is visiting next week and I thought it would be nice if I can let her use my old phone. Is this possible? Can you buy prepaid SIM cards at 7-11 and stuff? I don’t know anything about this stuff.

Yes, it’s possible.
You can no longer buy the sim cards at 7-elevens but you can by top up cards from them.
You should go to a telephone store branch and sign up (take 2 IDs - passport and ARC).

Or just buy it at the airport all you need there is your passport.